September weather forecast
Keyesville, CA

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Weather in September

September, the first month of the autumn in Keyesville, is still a warm month, with an average temperature ranging between max 79.3°F (26.3°C) and min 54.5°F (12.5°C).

Temperature

Keyesville's transition into September involves a gentle shift in temperature, receding from 85.3°F (29.6°C) in August to a still warm 79.3°F (26.3°C). Nighttime in September brings a stark departure from the daily high in Keyesville, California, resting at an average low-temperature of 54.5°F (12.5°C).

Humidity

In Keyesville, the average relative humidity in September is 35%.

Rainfall

In Keyesville, in September, it is raining for 3.4 days, with typically 0.24" (6mm) of accumulated precipitation. In Keyesville, during the entire year, the rain falls for 65.1 days and collects up to 12.28" (312mm) of precipitation.

Snowfall

In Keyesville, California, snow does not fall in June through October.

Daylight

In Keyesville, the average length of the day in September is 12h and 23min.
On the first day of September in Keyesville, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:38 pm PDT.

Sunshine

In September, the average sunshine in Keyesville, California, is 10.9h.

UV index

In Keyesville, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
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Frequently asked questions

What is the temperature in September in Keyesville?

In Keyesville, in September, the average high-temperature is 79.3°F (26.3°C), and the average low-temperature is 54.5°F (12.5°C).

What is the average humidity in September in Keyesville?

In Keyesville, California, the average relative humidity in September is 35%.

How much does it rain in Keyesville in September?

In September, in Keyesville, the rain falls for 3.4 days. Throughout September, 0.24" (6mm) of precipitation is accumulated.

When it does not snow in Keyesville?

June through October are months without snowfall in Keyesville, California.

What is the average length of the day in September in Keyesville?

In Keyesville, California, the average day length in September is 12h and 23min.

What time are sunrise and sunset in September in Keyesville?

On the first day of September, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:38 pm PDT.

How many hours of sunshine does Keyesville have in September?

The average sunshine duration in September is 10.9h.

What is the UV index intensity in September in Keyesville?

The average daily maximum UV index in September in Keyesville is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Keyesville, CA

Average temperature in September - Keyesville, CA
  • Average high temperature in September: 79.3°F

The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is December (49.3°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (32.4°F).

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Average pressure in September
Keyesville, CA

Average pressure in September - Keyesville, CA
  • Average pressure in September: 29.89"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in September
Keyesville, CA

Average wind speed in September - Keyesville, CA
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).

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Average humidity in September
Keyesville, CA

Average humidity in September - Keyesville, CA
  • Average humidity in September: 35%

The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is August (31%).

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Average rainfall in September
Keyesville, CA

Average rainfall in September - Keyesville, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is June (0.2").

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Average rainfall days in September
Keyesville, CA

Average rainfall days in September - Keyesville, CA
  • Average rainfall days in September: 3.4 days

The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is June (1.5 days).

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Average snowfall in September
Keyesville, CA

Average snowfall in September - Keyesville, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Keyesville, CA

Average snowfall days in September - Keyesville, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Keyesville, CA

Average daylight in September / Average sunshine in September - Keyesville, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 6h and 24min).

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Average sunshine days in September
Keyesville, CA

Average sunshine days in September - Keyesville, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is June (27.4 days).
The month with the least sunshine days is February (19.2 days).

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Average UV index in September
Keyesville, CA

Average UV index in September - Keyesville, CA
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are November and December (UV index 2).

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Average cloud cover in September
Keyesville, CA

Average cloud cover in September - Keyesville, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is March (Cloud cover 31).
The months with the least cloud cover are August and September (Cloud cover 6).

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Average visibility in September
Keyesville, CA

Average visibility in September - Keyesville, CA
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Keyesville, California, USA

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